Support bracket for a gas cylinder



FIG. 1 is an enlarged front perspective view of a support bracket for a gas cylinder showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view taken from the left of FIG. 1;

FIG. 4 is a top plan view thereof. 

The ornamental design for a support bracket for a gas cylinder, as shown and described. 